Alternate current/direct current (AC/DC) superimposed system for detecting particles in gas insulated switchgear (GIS)

Abstract

The invention provides an alternate current / direct current (AC / DC) superimposed system for detecting particles in a gas insulated switchgear (GIS). The AC / DC superimposed system comprises a direct current (DC) voltage voltage-multiplying cylinder (1), an alternate current (AC) voltage generator (2) and an ultrasound local-discharge test device (3). The AC / DC superimposed system provides a method for detecting metal particles in the GIS through superimposed AC / DC, and has the advantages of simple test, obvious effect, and the like.

Description

technical field [0001] The invention relates to the technical field of AC / DC high voltage superimposed partial discharge signal measurement and diagnosis for GIS defect diagnosis. Background technique [0002] Due to its key role in the power system, GIS (Gas Insulated Switchgear) is often used in important fields that require high reliability and high power supply continuity, so it takes on this important responsibility. At the same time, GIS is considered to be a maintenance-free product, but in the actual application of power production, it is found that GIS is not as effective as people imagined, and insulation problems often occur, and even cause GIS to malfunction. Therefore, electric power researchers hope to obtain substantive evidence of GIS internal insulation problems through a non-destructive testing method, and then notify the power supply department to perform switching operations in advance, safely trip this line, isolate insulation equipment faults, and perfo...

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Problems solved by technology

However, these methods mainly have their own characteristics, and there is still no good solution for the detection of metal particles, because the usual partial discharge detection methods include pulse current method, ultrasonic detection method and ultra-high frequency detection method. When the initial field strength of partial discharge and the initial electron collapse, this kind of defect will not produce partial discharge, because the pulse current and ultra-high frequency detection method does not have its obvious advantages, but the metal particles can be detected under the action of the electric field and the rubber hammer When hitting the GIS shell, metal particles will jump and release ultrasonic mechanical vibration signals. Even if there is no partial discharge phenomenon, the ultrasonic detection method has high sensitivity to the metal conductive particles inside the GIS.

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